The Reseach Of Enrichment Regularity For Chang 7 Oil Layer In The XiQu Oil Field

This paper made in-depth researeh of chang7 oil-layer distribution regularity of oil and gas in Xi Qu oilfield from sedimentary,structure,reservior etc,made full use of drilling,well logging and logging,experimenta1 analysis,the production test results etc.Through to the objective interval fine stratigraphic classification and correlation by characteristics of cycle combination,To push chang 7 oil-layer is divided into 71,72 and 73 three small layers;Found out the top of the small layer structure,summarized the microfacies distribution and its characteristic of reservoir lithology,properties,heterogeneity statistica and Classification evaluation,analysized the oil and gas distribution regularity and controlling factors.The results show that the formation of chang7 was development completely and similaration of thickness,developing east-west distribution of low amplitude nose lung structure and dome structure from west to east in turn up,developing deposits of middle and down turbidite fan;Microfacies types have mainly muddy water way,turbidite floodplains,turbidite endings,deep water basin,north and south to take on the whole-fan facies zone distribution;Mainly developinng feldspar silty sand rock,and the average porosity is 8.86% and average permeability is 0.31 x 10-3?m2,Calcium content has obvious negative effect on reservoir physical property,The permeability change is big and strong heterogeneity,developing mainly four types of reservoir is given priority to with class II,and belonging to low porosity and low permeability reservoir.developing mainly lithologic reservoir,reservoir are mainly distributed in chang71 and chang72 on the vertical and mainly distributed in the north and the south on the plane.Sand body Muddy water channel is controlling the reservoir space distribution,Better reservoir physical properties in high permeability zone can provide effective migration pathway,the top of the reservoir structure changes of ups and downs is controlling oil-water relative differentiation,leading to differences in the spatial distribution of oil and gas.So,oil and gas enrichment regularity is mainly influenced by the sedimentary micro facies control of reservoir physical properties,low amplitude structure on oil and gas enrichment has certain influence in local space in the chang7 reservoir,Xi Qu oilfield.